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本文采用CO、NO作为分子探针,应用红外光谱方法研究了钻和钌在加氢脱硫(HDS)催化剂中修饰钼中心的助剂作用。由实验结果发现,钻使钼中心吸附的NO量减少,而钌则使钼中心吸附的NO量增加。实验结果表明,钴担载在MoS_2的边角位置,与钼中心发生化学作用形成CoMoS相,这种COMoS相对CO和NO有吸附活性。而钌的作用则是促进氢的解离,进而这些解离氢溢流到MoS_2上发生还原反应,生成更多的配位不饱和钼中心。
In this paper, CO and NO were used as molecular probes to study the effects of diamond and ruthenium on the modification of molybdenum centers in HDS catalysts by infrared spectroscopy. From the experimental results, it is found that the amount of NO adsorbed on the molybdenum core decreases while that of ruthenium increases the amount of NO adsorbed on the molybdenum center. The experimental results show that the cobalt is supported on the corner of MoS 2 and chemically interacts with the molybdenum center to form the CoMoS phase, which has the adsorption activity to CO and NO. The role of ruthenium is to promote the dissociation of hydrogen, and then these dissociative hydrogen overflow to MoS_2 on the reduction reaction to generate more coordinated unsaturated molybdenum center.